This is an absurdly difficult piece to play, and those who can just rattle it off earn my immediate respect. For this I had to record it in six tracks, at quarter, third and half speeds, over about five billion takes, three click tracks and with an immense amount of general-purpose swearing. (I have recordings of me doing just that on this piece and it's not pretty stuff).
Why bother? Because it's a great tune. That's why. Listen and agree with me.